Slides in this set

Slide 1

Slide 2

1.1 Pathogens· Microorganisms that cause disease are called "pathogens"· Bacteria and viruses· Disease is a description of symptoms, either physical or mental or both. It suggests a malfunction of the body or mind which can adverse effect on good health…read more

Slide 3

Microorganisms as pathogensFor a microorganism to be considered a pathogen it must:· Gain entry to the host· Colonise the tissues of the host· Resist the defences of the host· Cause damage to the host tissues.When and pathogen is transferred from one individual to another it is known as "transmission".…read more

Slide 4

How they get into the body· By penetrating one of the organisms interfaces with the environment.· Skin forms thick, continuous layer and is an effective barrier to infection.· Invasion normally occurs when skin is broke.…read more

Slide 5

Interface entries· The Gas-exchange system. Pathogens can cause influenza, tuberculosis and bronchitis in this way.· The Digestive system. Food and water may carry pathogens into the stomach and intestines via the mouth. Cholera, typhoid and dysentery pathogen enter this way.…read more

Slide 6

Prevent entry· A mucus layer that covers exchange surfaces and forms a thick sticky barrier that is difficult to penetrate.· Enzymes break down pathogens.· Stomach acid, kill microorganisms.…read more